Commentary. This requires no Commentary. See, however, more fully, Galen and Rhases (l. c.)
SECT. XII.—ON THE PULSE, FROM THE WORKS OF GALEN.
The pulse is a movement of the heart and arteries, taking place by a diastole and systole. Its object is twofold; for, by the diastole, which is, as it were, an unfolding and expansion of the artery, the cold air enters, ventilating and resuscitating the animal vigour, and hence the formation of the vital spirits; and by the systole, which is, as it were, a falling down and contraction of the circumference of the artery towards the centre, the evacuation of the fuliginous superfluities is effected. The arteries themselves are oblong hollow vessels like the veins, but consist of two coats, in order to fit them for the afore-mentioned motion, and because they have to contain blood and spirits. They arise from the heart, and are distributed to all parts of the body; and, therefore, all the arteries pulsate in a similar manner, and like the heart, so that from one of them you may judge concerning all the rest. But the movement of all cannot be equally well observed; for those which are situated in parts not fleshy may be more conveniently felt, whereas those that are in fleshy parts are more indistinct. Nor is any one more conveniently situated for being felt than the one at the wrist. The first kind of pulses is in regard to the time of their motion, as observed in systole and diastole. Its differences are, the quick, slow, and moderate; because every body which is moved must be moved quickly, slowly, or intermediately, as to time; that is quick which is moved over a great distance in a short time; that is slow which is moved over a short distance in a long time; and that is moderate which is intermediate as to motion. The second kind of pulses is in regard to the extent of the diastole. For, since every body has three dimensions, length, breadth, and depth, and an artery is a body, it follows, that an artery must have these dimensions. When, therefore, an animal is in its natural state, you will find its arteries dilated moderately every way; but when not in its natural state, its dilatation will be deficient, or exceed according to some one of its dimensions. In calculating this, you must remember the natural state of the pulse; and if it is found to exceed in breadth, you must call it broad; if in length, long; and if in depth, high or deep. It is clear that the opposites to these, or those that are deficient, are to be named the narrow, the short, and the low. And with regard to those which are altered from the natural state in all their dimensions, that which is every way diminished is called small, and that which is every way increased, great. The third kind of pulses is with regard to the tone of the vital strength. The varieties are three, the strong, the weak, and the moderate. The strong is that which strikes the finger of the physician strongly, and the weak, feebly and faintly; while the moderate is intermediate between them, and is held by some to be the natural one; for that the pulse is rendered stronger by passion and baths, not being naturally so. In reply to which, Galen contends that a pulse rendered stronger by non-natural causes soon undergoes a change; and that, therefore, a strong pulse, which does not readily change, may be natural and moderate. The fourth kind is in regard to the consistence of the instrument, I mean the body of the artery. In this respect there are three differences; for the artery is either harder than natural, and is called a hard pulse; or softer, and is called a soft, or intermediate, and is called in this respect moderate. The fifth kind is in regard to the contents of the artery; and their differences are, the full, the empty, and the moderate, since every vessel must be full, empty, or moderately full of liquids. A full pulse, then, as Archigenes defines it, is one which indicates an artery that is completely full, and the impression of which is, that it is distended with fluids; and an empty one conveys an impression as if its contents were full of bubbles of air, so that the finger, when pressed upon it, seems to fall into an empty space. These five kinds of pulses regard one motion of the artery. And since the quality of the heat in the heart may be more developed than usual in the artery, some have hence reckoned a sixth kind of pulses. Of the other kinds, whether they are in regard to one or more pulsations, they derive their character either from the time of rest, or the rhythm, or their equality and inequality, or their regularity and irregularity. The kind, then, in regard to the time of rest, which is the seventh in order, is divided into the dense, the rare, and the moderate. And, since an artery has a double motion, composed of two opposite movements, it must of necessity have two seasons of rest: the one after the diastole before the systole, the other after the systole before the diastole, which to most people appears imperceptible; and, therefore, the interval of rest between two motions has been chosen. When, therefore, there is a long interval of rest, the pulse is called rare; when short, dense; and when intermediate, moderate. The eighth kind is in respect to rhythm. Rhythm, then, in general, is the ratio and proportion of one time to another. In regard to the pulse, it is, according to some, the ratio of the time of motion to the time of rest, as of the systole and diastole, to the intermediate time of rest; but, according to others, it is the ratio of a time of motion and rest to another time of motion and rest, or of motion to motion.
Of rhythm, then, there are two varieties, the rhythmic and the arhythmic. Of the arhythmic, there is a threefold difference: first, when there is a slight departure from rhythm; second, when there is a greater; and third, when there is no rhythm at all. Thus, for example; in a child, if his pulse has the rhythm of childhood, it is called its proper rhythm; if it has that of an adult, it is said to be an improper rhythm; or if it preserve no ratio at all, it is said to be devoid of rhythm.
The ninth kind of pulses is found in all the other kinds already mentioned; namely, that which regards equality and inequality, which may be remarked either in one pulse, or in many, which last is called the systematic, of which we must speak first, as being more clear. An equal pulse, then, is that which is alike in order, as regards magnitude, strength, frequency, and certain other, or indeed all its other, characters. The unequal pulse is that which is unlike in order. For, if all are alike, as, for example, all deficient in magnitude, such a pulse is called equal. But if the first, second, and third appear alike, but the fourth unlike, it is clear that such a pulse is unequal as to magnitude. Of this kind are the intermitting and the intercurrent. For not only after one or more great pulsations may one smaller occur; but sometimes this motion is wholly lost, and one pulsation is said to be wanting. The other kind, the intercurrent, is the opposite to this; for when we are expecting an interval of rest, a supernumerary pulsation, as it were, occurs. When the second is a little smaller than the first, and the third than the second, and the fourth than the third in like manner, and so onwards, such pulses are called sharp-tailed or myuri, deriving their names from figures terminating in a sharp point. Such as are altogether diminished, and never cease from this state, terminate in a total loss of motion, and are called failing or fainting myuri. There are two varieties in respect to those which fail, for some of them persevere in that state of smallness in which they terminated, whilst others attain again their original magnitude, or less or more, and these are called recurrent myuri. Pulses also are called myuri, from their inequality in regard to one pulsation, concerning which we will speak presently. And this is the nature of that inequality of pulse, called systematic. But it takes place with regard to one pulse, or one part of an artery, or more, as perhaps with regard to motion, for the inequality is observed on one part of the artery, when the motion of the artery upon the finger begins one way and terminates another, beginning quicker, and terminating slower, or reversely. This happens in a threefold manner, the motion either remaining constant, or being interrupted, or recurring and beating double, as it were. If, then, remaining constant and uninterrupted, it should change from quickness to slowness, or conversely, such a pulse is said to be, and is of unequal velocity. But if, after being interrupted by an interval of rest, it again appear quicker, it is called the goat-leap or dorcadissans, the term being derived from the animal dorcas, which, in jumping aloft, stops in the air, and then, unexpectedly, takes another and a swifter spring than the former. But if after the diastole it recur, and before a complete systole take place, strike the finger a second time, such a pulse is called a reverberating one, or dicrotos, from its beating twice. You may see such a thing take place upon a stithy, when a hammer, swung by the hand, first strikes the stithy, and afterwards, recoiling from the reaction of the stithy, strikes of itself a second or third time. And not only may an inequality in the time of motion take place as to one pulsation in one part of an artery, but also in regard to the strength of the power; not so, however, in regard to the extent of dilatation (for it is impossible that the same pulse in the same place should be great and small at the same time), nor in regard to the other kinds of pulses. But in different places different parts of an artery may exhibit a double inequality in one pulsation. For the motion may continue constant, and be swifter at one finger and slower at another; or it may intermit, and one finger may perceive it, and another not. And also, in regard to the extent of the diastole, the same inequality becomes apparent in different places. Of this kind are the myuri, diminishing once and again at one pulsation; for, if at the inner finger the pulse should be great and swelled up, but under the external at the thumb of the patient it appear smaller, such a pulse is called myurus, from its resemblance to the tail of a mouse; or meiurus, from its being diminished like a tail. But if the pulse appear great, and swelled under the middle finger, but smaller on each side, Archigenes called this impulse innuens et circumnuens, i.e. the declining, and the declining on both hands, wishing to mark the smallness of the diastole, with the declination, as it were, of the two extremities; for these parts do not appear as if they were cut short, but as if they were bent in, and a little contracted on each side, and hence the pulse is curtailed (myurus) on both sides.
And when the inequality as to magnitude takes place at different times, such pulses become undulatory and vermicular. And if irregularity of position be joined to them, they are called spasmodic and vibratory. Let us begin with the undulatory, in which the whole artery is not dilated at the same time, according to the same inequality, but this part of it first, that second, that third, and that fourth, the motion continuing constant like the swelling of the waves. And some have the wave carried straight forward, some obliquely; some have a sufficient altitude in a short expansion as to length, and some conversely; some have a broad, and some a narrow, and they have the like inequality in regard to quickness and strength. When the undulatory is wholly diminished in size, it is called the vermicular, which resembles the motion of a worm. As the undulatory pulse, when it goes on diminishing, terminates in the vermicular, so in like manner does the vermicular in the ant-like, or formicans, when, most of its motions being lost, it terminates in one, and it a very small motion. It is called formicans from its resemblance to the ant (formica), on account of its smallness and kind of motion. The ant-like pulse (called formicans) is very small, there being none smaller than it; and, in like manner, it is of all others the most indistinct and dense, but is not quick, as Archigenes supposed. Nearly allied to it is the hectic. For as there is a hectic fever, so is there also a hectic pulse, which undergoes little or no variation, but remains always alike contracted as it first began, and never expanding, the whole habit being turned into disease. The spasmodic pulses appear as if they were dragged, stretched, and drawn by the extremities, conveying the sensation of a stretched cord. But no such thing takes place in the vibratory; for in them the dilatation is greater, as if different parts of the artery were carried upwards at one and the same time. They may be resembled to darts, which, when thrown with force, are carried along with a vibratory motion. The pulse is serrated when part of the artery seems to be dilated and part not; the artery itself also appearing to be harder than natural. This pulse has some of the characters of the vibratory, and is quick and dense, but not always great. In addition to those mentioned, there is a tenth kind of pulses arising from inequality, namely, that with regard to regularity and irregularity. The unequal pulses being divided into those which are alike as to periods, and those which are wholly unlike, the regular and irregular are formed according to each of these divisions; from the equality of periods the regular is formed, and from the entire inequality the irregular. The equal pulse is also always regular (since consequently we call it alike); but the unequal is not altogether irregular; for, supposing it to have no equality, and yet to preserve a certain period, such, for example, as to extent of diastole, if there are two great and one small, then again two great and one small, and so on successively, such a pulse would be called anomalous, that is to say, unequal, but regular. But, if it not only had no equality, but likewise no order in its inequality, such a pulse would be not only unequal, but also irregular, and in like manner with regard to the other kinds. Of the irregular, some are altogether so, observing no period whatever; others are indeed regular as to periods, but, having no continued order, they may in this respect be called irregular, but in so far they observe a certain period regularly, they being regulated as to their periods. As if, for example, there were two great and two small, then three great and three small, and four great and an equal number small; and, returning again, two great and two small, three great and as many small, and so on in like manner. It is to be remarked that, of all the other opposite kinds, there is one intermediate between the two extremes, but that there is none between the equal and unequal, and the regular and irregular, unless you choose to call the one which is regular as to periods the medium between the regular and irregular. And the intermediate pulses of all the other kinds are the natural, except that which relates to strength and weakness, as we showed. But, in those we have been describing, the equal alone is the natural, and all the others are not natural, namely, the unequal, the regular, and the irregular. These are all the kinds of pulses and their generic differences. Some add two others to these, the one in regard to the position of the artery, according as it seems to be carried upwards or downwards, to the right or to the left, and the other in regard to the times of expansion. But these we treated of along with the undulatory and vibratory. And we, for the sake of brevity, have only delivered the simple varieties; but, from what has been said, one may easily connect them, and discover those which arise from their combinations.
The causes affecting the pulses are next to be treated of, with which is connected the prognosis from them. We shall begin with those which respect magnitude, because it is more obvious than the others. A great pulse is produced either by some urgent necessity, such as an excess of heat in the heart requiring refrigeration, and, as it were, ventilation from without; or it may arise from leanness of the body, as we shall soon show. The excess of heat is occasioned either by natural causes, such as the ages of manhood and youth, or simply a hot season, place, or a warmer temperament; or by non-natural causes, such as the air which surrounds us being hotter than common, hot baths, exercises, food, wine, heating medicines; or by preternatural causes, such as a hot intemperament, putrefaction of the fluids, passion, or the like. You may judge of these classes of pulse from the following observations. Those which are natural are permanent and not very susceptible of change, whilst the others readily change, so that often while you examine them, or generally after a very short time, they will altogether alter. A pulse also which owes its greatness to a hot bath has softness for an accompaniment; and hardness is generally combined with greatness proceeding from a hot intemperament, especially when combined with dryness of the system. Those who have undergone moderate friction or exercise have a pulse intermediate between hardness and softness; but they have the parts about the chest warmer than natural, which is the case also with those in a passion. Those that are influenced by food, the use of wine, or rage, have vehemence joined to greatness. Those who wish to conceal anger, or something which they have done without permission of the physician, (such as if a person has taken a heating medicine, and wishes to conceal it from the physician, who inquires about it while he feels the pulse,) in such persons a manifest inequality is joined to greatness. To the discovery of this state other considerations may contribute, such as the habit of the patient, as if he appeared to be fond of taking medicines, or his disposition, as if it be bad, and cunning at concealments. A pulse which is great from putrefaction of the fluids has a contraction more hasty than natural joined to its greatness. To form a great pulse, an urgent necessity is not alone sufficient; but the vital powers must also contribute, and a condition of the instrument or artery intermediate between hardness and softness. When the heat, therefore, is increased in the heart by any of the above-mentioned causes, in the first place the pulse becomes great, and, the greatness not being able to supply the want, quickness is straightway joined to it; and if that is not sufficient, density is superadded. Small, slow, and rare pulses are formed by the opposite causes. But when a change first takes place from a great, quick, and dense pulse to their opposites, namely, when the necessity is at an end, the first character of the pulse is not the first that leaves it, but it loses first that which it last acquired, becoming first rare, then slow and last small. But if the slowness and smallness should go on increasing, the rarity will again change to density, in order that the necessary want may be supplied. Such are the causes of greatness, quickness, density, and their opposite pulses. To these we shall connect the alteration of the pulse in regard to one dimension only. Breadth alone then is increased, principally by a redundancy of humidity, either natural, or from external causes, as loftiness is occasioned by the softness of the instrument, assisted by the vital power; but length is rendered apparent by the dryness and melting of the surrounding flesh, the other dimensions being contracted. For an artery cannot, in fact, become longer than natural; and this ought more properly to be called the lean pulse, as the opposite one, namely, that which is increased only in breadth and depth, should be called the fat. The pulse sometimes falls under the opposite characters to this, when it is restrained as to any of its dimensions, and appears low, narrow, and short, when it is not so in reality, but seems so, owing to the thickness of the fat, flesh, or membranes which press upon it. Sometimes, too, the whole seems small, when it is not so in reality; and feeble in like manner. And what do I say? Sometimes an asphyxy, or complete loss of pulsation, hath seemed to take place over the whole arteries, when there is no such thing in reality; and this has happened, more especially to those who have felt them carelessly, when the motion, being really indistinct, escapes notice, owing to the quantity of flesh; for it is impossible that a complete asphyxy could take place while the man is alive. In like manner again in the emaciated, small pulses appear great. When, therefore, the body is greatly wasted, the artery which runs along the spine has often been felt by persons touching the abdomen, and also the pulses in members which before used not to be felt. Wherefore we must attend to all circumstances, that we may not be mistaken in our diagnosis. A strong pulse is occasioned by the force of the natural faculty, when not counteracted by any other cause, such as the want failing, or from hardness of the instrument. But a feeble pulse may arise from weakness of the natural powers alone, although no other causes contribute. For a strong pulse stands in need of all the other causes for its formation; but the feeble is produced by weakness alone. The originally strong pulse accompanies moderate ages, seasons, places, and temperaments; but the feeble the immoderate. A pulse changing from feebleness to strength is formed by the vital faculty growing strong, from a preceding state of debility. It is strengthened either by things within the body, such as concoction of the fluids, or an excretion of them, or passion; or by externals, such as wines, food, exercises, and whatever will rectify the intemperament. The natural powers are weakened by want of food, watchfulness, immoderate evacuations, grief, cares, and more especially pains inducing syncope, and whatever forms an intemperament. Some inexperienced persons have thought a hard pulse strong, but a person of experienced understanding and touch will not mistake them; for a strong pulse, being mostly accompanied with greatness, is swelled up to loftiness and strikes the finger forcibly; but the hard does not admit of greatness, on account of the unyielding state of the artery. Wherefore a pulse becomes hard owing to the hardness of the artery. This is occasioned by immoderate cold, or dryness, or tension proceeding from inflammation, or spasm. To the hardness, moreover, are joined smallness, quickness, and sometimes density instead of greatness accompanying, owing to the exciting want. A soft pulse follows a humid state of the artery. An artery is rendered more humid by things not preternatural, such as more liquid food, immoderate baths, much sleep, a more abundant diet, and hilarity; and by preternatural causes, such as coma, lethargy, dropsy, and the other pituitous affections. A full pulse indicates an abundance of fluids, or plethora from food, or from drinking wine, as the empty, on the other hand, indicates deficiency of food or evacuation. When the body of the artery feels warmer under the finger, this indicates great heat in the heart, while the rest of the body is cold, or a certain spasmodic state of the arteries, which are warmed by the violent motion. Archigenes says that the place of the artery will particularly be found warmer in catochus and in those who are about to be affected with somnolency. With regard to rhythm, when the ratio of the times of motion and rest is equal, it indicates a proper temperament of the body, or no great departure from it, as in early age, and the otherwise well-regulated bodies. But when the time of rest is greater than that of motion, this indicates that heat prevails, as in adults and those of the adjoining ages; as, in aged bodies, which are entirely cold, the time of motion is greater than that of rest. It is to be remarked that inequality in regard to rhythm, being the measure of that as to quickness and density, this holds the place as it were of the matériel to the rhythm.
The intermittent and intercurrent pulses take place when the powers are oppressed, and, as it were, borne down; but the intercurrent indicates a lesser, and the intermittent a greater injury. And, in general, that state in which the powers are oppressed and borne down, changes the pulses to inequality and irregularity in every other respect, and also in regard to strength and greatness. The pulses called myuri, being shown to be of two kinds, (for they are found either in that inequality called systematic, or in regard to one pulsation), the failing or fainting evince the last prostration of the powers; but, when they return, or are recurrent, they indicate that the powers are weak, but that they are struggling, contending, and have not yet submitted. As to the myuri, in regard to one pulsation, called the failing, and the failing on both hands (innuentes et circumnuentes), these happen to persons who are gradually wasted by inflammations not yet resolved, and to those who are wasted from whatever cause, the bodies around the arteries being melted down. Pulses of unequal velocity, and those called dorcadissantes or goat-leap, principally accompany febrile heat. But if the pulse render the commencement of the diastole feeble, and increase in velocity towards the end and beginning of the systole, this indicates that putrefaction is prevailing, nature hastening on the discharge of the fuliginous superfluities. But if, on the other hand, it render the commencement of the systole feeble, and rather make speed towards the diastole, you may be sure that the heat is prevailing, and longing for refrigeration. These in fever are, for the most part, accompanied by density, and sometimes greatness, if the powers be not restrained by the hardness of the instrument. When the hardness of the artery increases, and the powers are not weakened, the double or reverberating pulse is formed. The undulatory pulse most commonly attends the more humid affections, such in particular as anasarcous swellings, lethargy, and peripneumony. When the powers of life are beginning to fail, but are still making a faint struggle, the undulatory pulse sinks into the vermicular; but when they decline to their lowest ebb, this last passes into the ant-like or formicans. The hectic particularly attends those in consumption and marasmus. The spasmodic pulse takes place when the origin of the nerves is suffering from some inflammatory affection, as in frenzy and acute attacks of epilepsy, when those affected with them die while they are yet warm, contrariwise to those in syncope, for they are alive after they have become cold. The clonodic or vibratory pulse takes place when the wants of the system require a great diastole, and the vital powers are sufficient for that purpose, but are opposed by the body of the artery; which, from its hardness, cannot be expanded to a large diastole, as happens in great inflammations and chronic obstructions. The serrated pulse is indicative of inflammation, and particularly in some tendinous parts. It is no less so of pleurisy, and when slight, indicates that the inflammation is gentle, and easily to be concocted; but when intense, that it is severe and of difficult concoction, and will be attended with urgent danger, if the powers be weak, or, if they be strong, that it will be slowly concocted, for it will either terminate in empyema, or a consumptive marasmus will supervene. One ought also to know that irregularity of the pulse commonly accompanies its inequalities; for you will rarely find an unequal pulse orderly. Wherefore, the lesser constitutional injuries occasion unequal and regular pulses, but the greater, unequal and irregular.
These are the simple causes of the pulses and their prognosis, and from them the compound, as we stated when treating of their differences, may easily be discovered.